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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2510.14173 |
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| _version_ | 1866908874752131072 |
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| author | Chen, Zhuo |
| author_facet | Chen, Zhuo |
| contents | The acceleration and unbinding of the common envelope during the plunge-in phase are governed by complex physical processes that often manifest observationally as luminous red novae. We investigate the dynamics of this phase using one-dimensional radiation hydrodynamic simulations evolved with the code {\tt Guangqi}. We perform a parameter survey to quantify the impact of key physical conditions on the unbound mass fraction, $η$, and the resulting light curves. Our survey spans a range of radiation-to-gas internal energy ratios ($\mathcal{E}/e_{\text{g}}\in[0.2,3.2]$), ratios of total envelope energy to gravitational binding energy ($ζ\in[0.54,2.87]$), and mass injection rates ($\dot{M}\in[2.5,10]M_{\odot}/\rm{yr}$), while covering both subsonic and supersonic expansion regimes ($v_{\rm ej}/v_{\rm esc}\in[0.3,0.6]$). We demonstrate that: (1) radiation pressure becomes the dominant driver of mass ejection in the high-opacity, high-luminosity region immediately below the recombination front; (2) $η$ exhibits a nonlinear dependence on $ζ$, which is modulated by the mass injection rate and gravitational potential; and (3) the recombination of atomic to molecular hydrogen ($\ce{H}\to\ce{H2}$) releases latent heat that sustains a secondary plateau in the late-time light curve. These findings are substantiated by detailed error analysis and convergence testing presented in the Appendices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14173 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | From Common Envelope Evolution to Luminous Red Novae I: A One-dimensional Radiation Hydrodynamic Model Chen, Zhuo Solar and Stellar Astrophysics The acceleration and unbinding of the common envelope during the plunge-in phase are governed by complex physical processes that often manifest observationally as luminous red novae. We investigate the dynamics of this phase using one-dimensional radiation hydrodynamic simulations evolved with the code {\tt Guangqi}. We perform a parameter survey to quantify the impact of key physical conditions on the unbound mass fraction, $η$, and the resulting light curves. Our survey spans a range of radiation-to-gas internal energy ratios ($\mathcal{E}/e_{\text{g}}\in[0.2,3.2]$), ratios of total envelope energy to gravitational binding energy ($ζ\in[0.54,2.87]$), and mass injection rates ($\dot{M}\in[2.5,10]M_{\odot}/\rm{yr}$), while covering both subsonic and supersonic expansion regimes ($v_{\rm ej}/v_{\rm esc}\in[0.3,0.6]$). We demonstrate that: (1) radiation pressure becomes the dominant driver of mass ejection in the high-opacity, high-luminosity region immediately below the recombination front; (2) $η$ exhibits a nonlinear dependence on $ζ$, which is modulated by the mass injection rate and gravitational potential; and (3) the recombination of atomic to molecular hydrogen ($\ce{H}\to\ce{H2}$) releases latent heat that sustains a secondary plateau in the late-time light curve. These findings are substantiated by detailed error analysis and convergence testing presented in the Appendices. |
| title | From Common Envelope Evolution to Luminous Red Novae I: A One-dimensional Radiation Hydrodynamic Model |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.14173 |